>> Unconditional Basic Income (UBI) is based on the assumption there will be no jobs for most humans in the future.

That is not true. It could work very well in today's society. And UBI is not designed to have every other guy slacking around, you will still need incentives to work (i.e. paychecks).

Basic Income can, in theory, have wonderful effects without much changing the working world: Taking the pressure off people and a give them a hell lot of freedom and a stronger stance in negotiations.